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For more information visit: www.agrovista.co.uk
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@AgrovistaUK
There is recent evidence to suggest that the UK yield plateau for wheat, which has lasted for around 20 years has fi nally been breached.
For the second half of the Twentieth
Century following the end of Second
World War, wheat yields rose signifi cantly.
This was very much the time for synthetic
chemistry to shine. Whenever a problem
arose, be it a weed, pest or disease, the
solution quickly appeared in a can, and a
combination of improved crop husbandry,
better varieties an ever-evolving chemistry
set led to yield increases of around about
1t/ha per decade.
From just before the millennium however,
this consistent increase in wheat yields
pretty much stopped and UK average yields
have stuttered around 7.5 – 8 t/ha ever
since despite continued improvements
with genetics and new varieties. The reason
for this yield plateau is probably down to a
combination of factors.
Poor grain prices and more severe weather
events during this period have not helped.
Another critical factor in preventing yield
increases is poor soil health. Deep soil
compaction (created by more frequent
passes of increasingly heavier machinery)
combined with over cultivation, a decline
in organic matter levels and reduced soil
porosity, are all significant contributing
factors to a decrease in soil health.
For some, diffi cult grass-weeds have been
the major challenge, and the lack of new
chemistry combined with the loss of many
established key products has certainly not
had a positive effect on yield!
The good news is over the last 3 seasons,
yields do appear to have improved, and
AHDB suggest this is potentially down
to several areas. Better grain prices, have
certainly encouraged farmers to push crops
again, and a bigger focus on soil health
appears to be key, with more growers looking
at all aspects of soil health from improving
drainage to increasing organic matter.
Maximising potential: A holistic approach
Over the past 5 years, based on solar radiation and rainfall levels, the theoretical potential yield of wheat in the UK has been consistently over 20 t/ha. During this period, leading farmers have been achieving over 60% of this potential, whilst the average UK farm is only achieving around 40%. Many of these farms are neighbouring to one another, so it is fair to assume they have received similar levels of solar radiation and water. The difference therefore must be how effi ciently each individual farm is using this available sunlight, and how effectively they are using and managing their water.
To fulfi l each farms potential, we need to focus on improving and maintaining soil health, and then create a growing protocol for each variety focussing on all aspects of husbandry and agronomy from establishment to harvest. This will include a major focus on nutrition, disease control and canopy management to ensure we maximise water use effi ciency and convert the available solar radiation to harvestable material as effi ciently as possible.
To facilitate this, Agrovista are continuing to develop practical grower protocols for key varieties in all situations. This work has been a fundamental part of Agrovista trials work at our trials hub in Stoughton near Leicester for many years, where we are focussing on optimising fungicide programmes, herbicide regimes along-side pioneering innovative nutrition, bioscience and canopy manipulation programmes.
In addition to this practical industry leading work at Stoughton, we are replicating this farm-scale work on our regional sites situated throughout the UK, so the development work can be thoroughly tested across a range of different soil types, cultivation and establishment techniques and climates.
There will be regular opportunities to come and see the work for yourself at numerous open days and evenings over the spring and summer. You can see a little more about the trials work being undertaken at some of our regional sites on the next pages.
Agrovista are continuing to develop practical grower protocols for key varieties in all situations
CHRIS MARTIN: Technical Manager - North.
For more information visit: www.agrovista.co.uk2 | AGROVISTA SELECT
Regional Development TrialsA local approach to agronomy
Down Ampney Site Coordinator: Quentin Ham
The South Western regional trials site is held by kind permission of Manor Farm, Down Ampney. Sitting at 270ft above sea level, this site is open and exposed to the elements.
The soil on the main site is primarily heavy clay however, across the farm we also see Cotswold brash and chalk. Trials work here ranges from small plots to full tramline widths for replicated farm conditions.
At Down Ampney, our trials team are conducting autumn work on oilseed rape establishment options at differing levels of cultivation with / without companion plants.
A comparison of winter barley vs spring wheat after cover crops will investigate blackgrass control and gross margin, among other factors.
Wheat establishment work involving four varieties will compare the impact of using less tillage at drilling on the germination and development of the crop and any other differences, for example blackgrass levels. A small plot variety screen and fungicide input comparison is also taking place.
Visitors to the site will also see split fi eld work on enhanced winter wheat nutrition vs standard approach, to evaluate the value of strobilurins in a barley fungicide programme.
The site is being monitored by our Plantsystems Precision Agronomy team, who have set up a weather station for accurate local conditions and will conduct regular drone fl ights and scanning, to build up knowledge and data.
An Open day is scheduled for late June and will address many technical and business challenges from fi eld to farm offi ce including tyre pressure / compaction, compliance schemes and business support. There will be the opportunity to discuss machinery with local dealers/manufacturers and variety selection with seed specialists, Ebbage Seeds.
For more information on the site or to arrange a visit contact your local Agrovista agronomist, or the regional site coordinator.
South West
Winter wheat establishment & cover crops (inset) at Down Ampney
Western Region
Northern Region
Midlands
Yorkshire
South West
Eastern Region
Sellindge
Patrington
DoncasterScunthorpe
Goole
Shropshire
Maidwell
Down Ampney
Lamport Stoughton
Croft
Morley
Coldham
Cockle Park
East Linton
Elgin
Ayr
Penrith
N
Cockle ParrkC
East LinEast LintonEast Lin
n
Agrovista RD team are planning to capitalise and expand on the existing projects at Penrith, Ayr, Elgin and in the Borders. They will be looking at several projects including varietal agronomy including amino acids.
These and future trials will concentrate the regional needs for the Scottish farmer and will be driven by local input. Full details will be published later.
John Murrie
Technical Manager - Scotland
3 | AGROVISTA SELECT For more information visit: www.agrovista.co.uk
Shropshire Site Coordinator: Rosie Tomlinson
The Western Region Innovation Site is located near Frodesely, Shropshire. The soil type is typical of the area with a good water holding capacity and yield potential although septoria control is always a challenge. Soil organic matter, nutrient status and structure have been assessed by our Plantsystems team using precision techniques with a VERIS U3 sensor.
Replicated trials are focused on evaluating new and upcoming wheat varieties and how to maximise their potential with agronomic packages tailored specifi cally to break yield barriers with variety specifi c inputs. This will include testing yield responses from the latest fungicide chemistry.
A field scale experiment is testing four of the latest varieties of wheat under the different establishment methods of direct drilling and minimum tillage. Strips were drilled on the 16th October using either a John Deere 750A direct drill straight into the previous oilseed rape stubble following a straw rake or a Kverneland accord combination drill following a Sumo Trio. This will allow a true comparison of varieties under different establishment systems and how this may affect crop agronomy and performance.
A further fi eld scale experiment will investigate a range of bio-stimulant products including ones containing amino acids and seaweed extracts. The aim is to determine the role bio-stimulants play and if they can be built into the programme to help fungicides produce stronger, healthier plants. Crop and soil health will be assessed across all experiments.
All of these trials will be demonstrated at an open day early in July, with additional dates at key points throughout the spring.
West
Top: VERIS U3 Below: Winter wheat establishment
Stoughton Site Coordinator: Dan Knight
They say all roads lead to Rome; however, it could be argued that as far agronomy trial sites in the Midlands go, they lead to Stoughton!
With around 80 acres of trials, it is safe to say Stoughton is an R&D fountain of knowledge the ancient Greeks would have lauded over. With trials ranging from traditional winter wheat varieties, establishment methods, optimising spray application and specifi c agronomy input blocks, but to name but a few, there really is something for everyone.
At the heart of the trials is innovation to push boundaries whilst reinforcing the basic principles of good integrated agronomy. This provides forward thinking and targeted agronomy through optimising existing practices and embracing new technology such as precision. Ultimately, in times of uncertainty this helps provide solutions to growers to help release their full potential.
The trials at Stoughton are spread across a range of fi eld sites and soil types. However, many are situated on the often challenging, Leicestershire clay soils in the balmy climate of the Costa del Stoughton (if only). Subsequently, these trials do not just provide information, but critically relevant regional information to all those who face similar challenges to those at Stoughton. Interactive grower meetings have previously been held last summer and most recently in December 2017.
A summer meeting for early July has already been confi rmed, so keep an eye out for more information in due course. But if that is not enough, Stoughton trials are open 365 days a year, whether it be something specifi c or an overall tour, bespoke tours can be catered for. So, if it’s knowledge you crave, just remember - all roads lead to Stoughton. To arrange a tour or discuss the techniques on show, contact your Agrovista agronomist or the regional site coordinator.
Midlands
Top: OSR with companion plants Below: Winter wheat variety trials
4 | AGROVISTA SELECT For more information visit: www.agrovista.co.uk
Yorkshire Site Coordinator: James Brentnall
We have several trials sites in Yorkshire for 2018 with soils across
the current sites are typical of the region, comprising of sandy
loam to silt and silty/clay.
Our regional development team will be looking at OSR
establishment with vs without companion plants and with vs
without legs at various depths.
Several varieties of winter wheat are being put through their
paces as we evaluate the effect that different cultivation
approaches have on crop performance. Also under evaluation is
the performance of varieties in a late-drilled situation.
In a region with high blackgrass populations, our team will be
looking at the performance of pre-emergence herbicides in a
small plot, blackgrass matrix.
Our Plantsystems team are monitoring the site with both soil
scans, using the VERIS U3 and regular drone imagery to capture
crop performance throughout the season.
The sites in Yorkshire are available to view for most of the
season. If you are interested in learning more about the
development work being carried out, please contact your local
Agrovista agronomist or the regional site coordinator.
Yorkshire
High disturbance area (after drill) Low disturbance area (after drill)
Eastern Region
ColdhamSite Coordinator: Jack Hoyles
The Coldham Estate near Wisbech Fens farms around 1500 ha. At this site we are demonstrating 5 trials, each representing how new innovations are heading into farming practice today. The soils on site range from silty clay loam to clay loams.
The farm at Coldham Estate comprises of soils ranging from silty clay loam to clay loams and boasts a mixed rotation including potatoes, onions and cereals. Having a good soil type to work with and excellent management help from the estate, we will demonstrate some great trials worth seeing.
Visitors to the site will also see trials with spring cropping/cover crops, OSR drilled with companion plants and winter wheat trials with fungicide treatments across different establishment methods.
The planned open day event will be held in early July with guest speakers, food for attendees, equipment demonstrations and NRoSO / BASIS points. The trials plots are monitored by our Plantsystems Precision Agronomy team who are using drones to collect information on establishments and recording emergence. The Plantsystems team have also installed a weather station to monitor and record weather ranges and gather data for disease and growth habits.
Farmers who are interested can look around the trials, which provide growers with relevant information and new ideas to go away with. Please contact your local agronomist or regional site coordinator for more details.
Top: Fallow vs. cover crops Below: Winter wheat input trials
For more information visit: www.agrovista.co.uk5 | AGROVISTA SELECT
Maize Grass TrialsThe benefi ts of growing maize and grass together
Undersowing maize with grass can provide a valuable green cover crop after harvest to reduce damaging soil erosion and nutrient loss often seen in over-wintered bare stubbles.
Ongoing trials led by Agrovista in
partnership with Reaseheath College
and Pottinger UK, have confi rmed that
provided the right species are sown at
the right time and in the right place, the
technique does not negatively affect maize
yields and can even enhance them.
“Growing maize and grass together is
gaining favour in Europe with farmers
who need to keep in line with tightening
environmental legislation,” says Agrovista
agronomist John Ball.
“It is a technique we’ve been keen to
examine here to help future-proof the
crop. Concerns over the environmental
impacts of maize are increasing. Leaving
bare maize stubbles may soon no longer
be allowed.”
Two years of large-scale in-fi eld trials at
Reaseheath College, Cheshire, based on
several years of earlier small plot work
are producing new recommendations to
help growers achieve optimum results,
says Mr Ball.
Sowing the grass at the same time as the
maize has produced the most consistent
performance, but maintaining a 15cm
gap between maize and the companion
plant is key.
“In both years we used a Pottinger
Aerosem seed drill to establish the maize
in 75cm row widths and sow grass in three
rows spaced equally between the maize.
“This achieved the all-important 15cm gap
between the different species, to prevent
the grasses from smothering the crop.”
To help further, the maize variety Pioneer
P7326 was chosen for its good early vigour.
In 2016 a range of grass-based mixtures
were tried, but tall fescue produced the
best results in terms of cover and also
produced the best yielding maize crop, at
just over 21t DM/ha.
“The other grasses were not far behind in terms of maize yield, and overall we saw a small uplift from sowing companion mixtures with the maize. However, these grasses were nowhere near as good as tall fescue in terms of providing cover once the maize had been cleared.
“The ryegrass grew too rapidly and ran out of steam in mid-August, so there was much less green material present after harvest, while creeping red fescue was mulched by harvest traffi c. The tall fescue had a much bigger root system and grew more steadily, so was able to pick up quickly once the crop was gone.”
The increased maize yield was probably
due to the grass roots improving soil
condition, allowing the crop, which is a
weak rooter, to exploit more of the soil
profi le, says Mr Ball. The tall fescue was
also good at smothering weeds.
In 2017 the mixtures were fi ne-tuned,
based on two Agrovista Technisward
mixtures. Soil Max is a combination of
tall fescue and Advanced tall fescue.
The Advanced component of the mix
is a tall fescue/ryegrass cross with
good persistence and stress tolerance -
important under maize where moisture
and nutrients can be scarce. Enviro Max
is a mixture of late perennial ryegrass and
Advanced tall fescue.
Soil Max produced the best maize yield of
the two grass mixtures, at 18.5t DM/ha and
produced the best over-wintered cover
crop by far, says Mr Ball.
Although including vetch to the mix increased
yields, the resulting cover crop was poor and
thin. “It brought nothing to the party but
added to the seed cost,” says Mr Ball.
“As a result of these trials, we are now
recommending Soil Max as the companion
crop of choice when drilled at the same
time as the maize.
Continued back page
we are now recommending Soil Max as the companion crop of choice when drilled at the same time as the maize
Pottinger Aerosem seed drill
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“As well as providing the best yield/cover combination, the slow-growing tall fescue and Advanced tall fescue help to suppress weed emergence and retain residual nutrients post harvest, thanks to a large and deep root structure that also benefi ts the soil profi le.”
The mixture also offers good grazing for sheep, an added benefi t of this technique, says Mr Ball.
Standard herbicide treatments can be used successfully with the one-pass establishment technique. In 2016, a post-em strategy was employed using mesotrione, which generally worked well, although control was less effective in some areas.
In 2017, a pre-em treatment of pendimethalin followed by mesotrione + pyridate at the three-to-four leaf stage was used. “We achieved better weed control and the grass came though well – we didn’t see any adverse effect in terms of establishment,” says Mr Ball.
Growers without access to a Pottinger drill could adapt other maize drills to sow grass between the maize rows and preserve the 15cm gap, he adds.
“However, the key is to drill the seed or at least ensure it has good seed-to-soil contact, rather than using a seeder box where establishment can suffer and you lose the gap between the maize crop and grass, so competition and shading losses increase.”
Over-sowing grass Further work during 2016 showed it is possible to establish the grass post drilling of the maize crop. In 2016 several grass and legume mixtures were over-sown when the maize had four to six leaves, using an Aitchinson direct drill.
“It produced some good results, but it was more diffi cult to maintain the maize/grass gap and shading of the companion mixtures was more of a problem at this stage,” says Mr Ball.
“The perennial ryegrass/tall fescue mix achieved the best results. The ryegrass established more quickly and, because it was sown at a later date, did not suffer from early senescence. The mixture produced a good carpet of grass post-harvest.”
However, maize yields can be reduced by up to 7% using this later technique, probably due to disturbance of the young maize roots at drilling, and the fact that the less developed grass roots provided less benefi t for the maize roots.
Herbicide application can be tricky, as it can clash with the sowing date of the grass seeds, but minimal effects were seen on the companion crop even when vetches and clovers were included.
Although a further overseeding trial had been planned in 2017, the narrow drilling window was missed. “The maize had been drilled into a dry seed-bed, but took off when rain arrived,” says Mr Ball. “It rushed through the 4-6 leaf stage and we would have ended up causing more harm than good.”
Mr Ball recommends growers planning to establish grass at this stage should use the Enviro Max mixture. This has the best chance of establishing before the maize canopy develops fully, enabling it to produce excellent ground cover with a fi brous root system for soil stabilisation that is also suitable for grazing.
Further work in 2018 will look at developing the potential of over-seeding, examine the suitability of new companion crop varieties and investigate further mixtures.
Potential undersowing benefi ts:
• Reduced nitrate leaching• Allows earlier applications slurry/
digestate applications• Improved slurry/digestate utilisation• Improved soil structure• Reduced soil erosion• Improved organic matter levels• Winter grazing for livestock
Trial summarySowing grass with maize:
• Pottinger Aerosem drill can establish companion plants consistently
• No detrimental effects on crop yield • Grass selection needs to account for
early vigour and persistent growth• Fescue seem to have best mix of
vigour and persistence• Pre-em herbicide showed no effect
on establishment • Clovers and vetches not effective
with this system
Over-sowing when maize at 4-6 leaves
• Additional operation requiring man and machine increases costs
• Tall fescue gives best growth and deeper rooting
• Herbicide timings can be a problem• PRG gives best ground cover and
fi brous roots stabilise soil
Soil Max companion crop
